My brother bought an apt in Mexico and lived there

My brother bought an apt in Mexico and lived there for 5 maybe 6 years. He had a squatter move in above his place who gave everyone in the building trouble. Turns out that guy bought the place under the table so the original owner deferred the income tax until he dies, which seems to be typical. My brother got fed up and sold his place. He had a delay selling because there was still a mortgage on it that was never paid off. Yet it was, my brother bought it free and clear. Turns out the original lawyer never filed the paperwork and died. He finally had the original law firm find the papers and file them. That's how screwed up things can be down there. Could be something similar going on with Cinco Minas and who owns it.